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    SubjectRe: [PATCH v2 2/4] mm: handle uninitialized numa nodes gracefully
    On Tue, 14 Dec 2021, Michal Hocko wrote:

    > This patch takes a different approach (following a lead of [3]) and it
    > pre allocates pgdat for all possible nodes in an arch indipendent code
    > - free_area_init. All uninitialized nodes are treated as memoryless
    > nodes. node_state of the node is not changed because that would lead to
    > other side effects - e.g. sysfs representation of such a node and from
    > past discussions [4] it is known that some tools might have problems
    > digesting that.

    Would it be possible to define a pgdat statically and place it in read
    only memory? Populate with values that ensure that the page allocator
    does not blow up but does a defined fallback.

    Point the pgdat for all nodes not online to that readonly pgdat?

    Maybe that would save some memory. When the node comes online then a real
    pgdat could be allocated.

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